Function realsense_sys::rs2_depth_frame_get_units

pub unsafe extern "C" fn rs2_depth_frame_get_units(
    frame: *const rs2_frame, 
    error: *mut *mut rs2_error
) -> f32

retrieve the scaling factor to use when converting a depth frame's get_data() units to meters \return float - depth, in meters, per 1 unit stored in the frame data